Adding machine



R. L. MULLER ADDING MACHINE Feb. 2, 1932.

Filed Dec.

8 SheetsSheet 1 ATTdRNEYe R. L. MULLER ADDING MACHINE Feb. 2, 1932.

Filed Dec. 18 1925 8 Sheets-Sheet 2 ATTORNEYS @ifw R. L. MULLER Feb. 2, 1932.-

ADDING MACHINE Filed Dec. 18, 1925 E ATTORNEYG R. L. MULLER Feb. 2, 1932.

ADDING MACHINE Filed Dec. 18, 1925 8 Sheets-Sheet 4 W m M ATTORNEYS,

Feb. 2, 1932. MULLER 1,843,648

ADDING MACHINE Filed Dec. 18, 1925 8 Sheets-Sheet 5 HIIIIIII INVEN TOR fl TTOR/VEYS Feb. 2, 1932. MULLER 1,843,648

ADDING MACHINE Filed Dec. 18, 1925 8 Sheets-Sheet 6 OZ /7 Z 7/7 7 ATTORN EY6 8 Sheets-Sheet '7 6 oodm: 8 8m fimmz 3 3 m 8 95 mm. M m 2m 52 59am 2 1:; PS5 2955i; J m 95 243. m m V T N A BYW,

R. L. MULLER ADDING MACHINE Filed Dec.

Feb. 2, 1932.

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Filed Dec. 18, 1925 8 SheetsSheet 8 ATTORNEYS.

Patented Feb. 2, 1932 UNITED STATES PATENT OFFICE ROBERT L. MULLER-,0! DETROIT, MICHIGAN, ASSIGNOR TO" BURROUGHS ADDING MA- CHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN ADDING MACHINE Application filed December 13, 1925. I Serial No. 76,147.

I This invention relates to adding machines.

' and its purpose is to provide improvements adapted to render the adding machine particularly adaptable for use in bookkeeping operations in banks and other business institutions where dates, folio numbers, accounts and other items are required to be recorded in some predetermined plan or arrangement, as,

for example, in a number of parallel columns upon a relatively wide ledger sheet of alooseleaf ledger system.

The present invention relates primarily to the printing department .of an adding machine and its principal purpose is to provide means for effecting the automatic elimination of imprints so that only the desired records may be printed in predetermined columns of the ledger sheet. For example, where the work to be done requires the subdivision of the printing melchanism for the printing of dates, folio numbers and amounts, and the bookkeeping system requires that the printing of one or more of these items be omitted in certain columns of the ledger sheet, the present invention operates automatically to block or render inoperative, in the proper column positions, the printing mechanism relating to those items which are not to be printed in those respective columns, although having 30 been previously set up in the adding machine.

This arrangement avoids repetition of fingering for the setting up in the adding machine of matter which may require printing more than once in the same tabulation, and prevents the printing, in certain positions of the paper carriage, of those items which are not to appear in the corresponding columns ofthe sheet.

The present invention is an improvement upon the means for imprint elimination disclosed in the patent to Malcolm F. Gascon, No. 1,395,991, dated November 1, 1921, and in my prior Patent No. 1,397,774, dated November 22, 1921. In the said Gascon patent, there is provided control mechanism operated by fixtures associated with the paper carriage for effecting the elimination of the action of certain printing mechanism such as the spring driven hammers belonging to different divisions of the printing department of the machine when the carriage is in certain positions, the automatic elimination of the operation of the printing mechanism in certain column positions of the carriage being effected by the tabulating movement of the carriage. The present invention retains the advantages of the Gascon invention but makes it possible to secure an increased number of imprint eliminations and a-greater number of possible combinations of imprint eliminations with a given arrangement of carriage controlled mechanism. The present invention has the further advantage that, with the same setting of the parts associated with the traveling carriage, different combinations of imprint eliminations may be secured in a given column position which may be of particular advantage when using the adding machine for printing items which should be either added or subtracted according to the character of the item. .The present invention therefore combines the mechanism for efiecting imprint eliminations with means for converting the machine from an adding to a subtracting machine according to which the setting of the machine for effecting the subtraction of a withdrawallitem automatically changes the imprint elimination mechanism so that a different arrangement or combination of the imprint elimination may be efiected in that or succeeding .columns than would be the case if the item in question were to be added. Other features and advantages of this invention will appear-more fully and in detail hereinafter.

The invention has been illustrated in the accompanying drawings in connection with an adding machine of the familiar Burroughs type. In the drawings, Fig. 1 represents a sectionalized left side elevation of the Burroughs adding machine, illustrating the imprint elimination or hammer block mechanism of the present invention under normal conditions; Fig. 2 represents a sectionalized front elevation of the principal parts of the hammer block mechanism of the present invention illustrating the parts in normal position; Fig. 8 shows a fragmentary right side elevation of the adding machine,

their normal positions,

illustrating the manually operated withdraw. key depressed, after having been released by the action of a lug on the tabula tion rod of the paper carriage; Fig. 4 shows a cross section through the side frames of the printing mechanism, illustrating a front elevation of the cam shaft and associated parts by which the imprint elimination or hammer blocking is effected, the cam shaft being shifted longitudinally from its normal position to vary the hammer block setting; Fig. 5 is a skeleton perspective View, with various parts broken away, showing the train of mechanisms controlled by the travel of the paper carriage for varying the hammer block or imprint elimination setting and the mechanism actuated by the movement of the withdraw key for varying the arrangement and effect of that settlng; Fig. 6 shows a transverse section through the side frames of the printing mechanism'and through parts associated with the hammer block cam shaft, the view being similar to that of Fig. 4 but illustrating the parts in their normal positions corresponding to the normal upper position of the withdraw key; Fig. 7 shows a left side elevation of the principal moving parts of the hammer block mechanism in illustrating the entire release of the catches of'the hammer block mechanism from the hammer block bail, thereby permitting printing of any matter set up throughout the entire printing department of the machine; Fig. 8 shows a perspective view of the hammer block cam shaft and associated parts in disassembled or spread-out relation; Fig. 9 illustrates a left side elevation of the hammer block mechanism and associated parts, similar to that of Fig. 7, except that the hammer has been released by the action of one of the cams on the cam shaft depressing one of the catches and thereby allowed to move slowly forward without percussive action during the operation of the adding machine; Fig. 10 shows a partial sectionalized side elevation of the adding machine, illustrating the train of mechanism by which the depression of the withdraw key serves to convert the machine from an adding machine to a subtract-ion machine; Fig. 11 is a horizontal section taken on the line 11-11 of Fig. 1; lg. 12 shows a rear elevation of the carriage of the adding machine and associated parts, illustrating the arrangement of the stops and rollers for determining the different column positions of the carriage and for determining those hammer block settings which are effected in= dependently of the withdraw key; 13 is a diagram illustrating certain examples of work which may be done on a ledger sheet by the particular embodiment of the imprint elimination mechanism illustrated in drawings of the present application; i l shows a side elevation of the hammer mechanism of an adding machine embodying a modified form of the invention, this view illustrating the connections from the withdraw key to the hammer block cam shaft and the means for rotating the cam shaft by the movement of the carriage; Fig. 15 shows a cross section through the side frames of the printing mechanism on the line 15-15 of Fig. 14, illustrating a front elevation of the hammer block cam shaft and the modified mechanism for operating it; Fig. 16 shows an enlarged vertical section on the line 16-16 of Fig. 15; and Fi 17 shows a front elevation of the cam shaft embodied in the construction shown in Figs. 14 and 15 with the shaft shifted longitudinally by the action of depressing the withdraw key.

The printing mechanism illustrated in the accompanying drawings is that commonly known in the art as a part of the Burroughs adding machine, comprising a series of main levers 611 which are hung upon a cross-shaft 600 of .the machine and which carry at their rear ends the movable type plates 618, each bearing two types. There are as many of the levers 611 as there are denominations represented on the keyboard of the machine and, as is well-known, the levers are oscillated upwardly at their rear ends through distances which vary according to the particular keys of the keyboard which are depressed, with the result that the types corresponding in value to the keys depressed are presented in position for printing on the sheet of paper carried by the roller 17 of the paper carriage C. The type plates 618 are adapted to be actuated by a series of hammers 715, one of which is provided for each lever 611, and each hammer 715 is arranged to be driven in the well-known'manner by a driver 716 through the action of a stud 753 entering the slot 715 in the hammer. The drivers 716 are actuated by springs 780, as in the usual Burroughs construction, and the hammers are normally restrained by means of latches 717 which are mounted for pivotal and swinging movement and which are under the control of swinging pawls 718, one of said pawls being provided for each latch. The hammer driving levers 716 and their hammers are restored to their normal positions through the action of a restoring bail 712 which is pivotally mounted and adapted to be operated by a link 802 which connects the bail with a plate 801 fastened on the drive shaft 800. The shaft 800 and restoring bail 712 are parts of the adding machine which are operated or reciprocated in each operation of the machine.

The printing mechanism proper is subdivided into a number of sections by omitting the overlapping tails a" which normally provide an interconnection between the adjacent latches as shown in Fig. 11. In the embodiment illustrated, the overlapping tails are omitted to provide as many as three sections 7 of illustrating the use of the machine in printlatches,

, and a catch 717 ing the example of work shown in Fig. 13, the different sections of the printing mechanism may be taken as adapted to print the dates,

folio numbers and amounts which are to be" p illustrated in Fig. 13-, no hammer blocking printed in the bookkeepingoperation.

Y The left-hand section of the printing mechanism comprising three hammers and latches is for use in printing the date and this division of the printing mechanism is itself subdivided, with respect to the cooperative tripping action between the first and second since there should of course be no cipher printed between the month abbreviations and the date, when the latter has but a single numeral. which controls the hammer for printing the month abbreviation does not have a tail (1 overlapping the next adjacent latch which controls the hammer for printing a tens numeral of a day date. However, for the purpose of hammer blocking, these two latches are provided with coupling devices so that a preliminary tripping of the middle one of the three latches of this section of the printing mechanism will be accompanied by the tripping ofthe other two, it being observed that the middle latch has atail overlapping the third latch, as'shown in Fig. 11. There is applied to this middle latch a pitman-717, is pivoted upon the forward end of this pitman, this catch being normally upheld by a s ring 717? having its upper end attached to a xed cross-bar of the frame. In the resent instance, the catch 717 has a lateral stud 717, as shown in Fig. 7, which when the catch is depressed, will take a position in front ofthe later-all turned end of another pitman 717 which is pivotally connected at its forward end to the first catch 717, as shown in Fig. 9. V

The catch 71.7 has ashoulder a (Fig. 9) on its underside which is normally above the path of movement of the cross-bar 160 of a bail whi h is vibrated in every 0 eration of the macEine. When the catch 717. is depressed y, the o eration of the mechanism hereinafter described, the shoulder a thereon is brought into the path of the cross bar 160 so that atthe outset of the operation of the machine, the pitman 717 is drawn rearwardly and with it the pitman 717, and thus the a three latches of the date'section of the printcussive' function, 1

ing mechanism are tripped and their hammers released, and there y deprived of per- I being understood. that the third latch'of the date section is tripped by the'overlapping tail (1 of the second or middle latch. 'Thi's tripping of the latches of the date section at the commencement of the operation of the'adding machine causes the ham- -mers" and their driversto move slowly forward in a manner which commonly termed walking Therefore, the first latch 717.

The second section of the printing mechanism proper has four sets of printing devices in the form of ,machine illustrated, which means that there are four hammers 715 to be controlled, although, for the purpose of effecting the printing of the example of work of this section of the printing mechanism is required. All of the latches 717 of this section of the printing mechanism, which is for use in printing the folio numbers on the ledger sheet, are connected by the overlapping tails d so that the tripping of one of ,these latches will effect the tripping of all The third section of the printing mecha nism proper, which is for use in printing the amount or transaction on the ledger sheet, is provided with a pitman 717 and a catch 717, the pitman being connected with the latch 717 controlling the first hammer of this series, and this catch 717 is adapted, also, when depressed to be operated upon by the bail bar 160 so that, if the catch is depressed, a preliminary tripping of the latches of this section is effected at the commencement of the operation of the adding machine, thereby eliminating the printing of the amount in that column of the ledger sheet at which the depression of the catch 717 occurs. The catches 717 and 717 may be'selectively or collectively depressed, by the mechanism hereinafter described, to effect the blocking of either the date section or the amount printing section of the printing mechanism, or both of these sections of the printing mechanism may be disabled at the same time, or, if desired, pitmen and catches may be provided for all sections of the printing mechanism to permit the collective or selective hammer -170 extends transversely of the printing mechanism above the catches 717 and 717 and is'provided with a series of outwardly projecting cams or lugs. Four of these cams or lugs 170 are provided for engagement with the catch 717 in either of two longitudinal positions of the shaft and there is also provided an angularly disposed lug 170?, of greater width than the lugs 170 adapted also to be engaged by the catch 717" as viewed in Fig. 6, the shaft 170 is the shaft while the lug and catch are in contact. At an intermediate part'of the shaft 170, there are provided two angularly disposedand outwardly projecting lugs 170' which are adapted to engage and.

and 170 depress the catch 717 in each of two longitudinally shifted positions of the shaft 170. In a similar way other lugs, or cams may be provided for engagement with catches arranged to control other sections of the printing mechanism. The shaft 170 is mounted between the side frames 31 of the rinting mechanism in the manner illustrated particularly in Figs. 4 and 6. At its left-hand end, pro vided with a cup-shaped member 32 adapted to enter the bearing socket 33 carried by the adjacent frame member 31. The opposite sides of the cup-shaped member 32 are provided with longitudinal slots or notches 32 as shown particularly in Fig. 8,and these notches are adapted to be engaged by lugs 34 formed on a coupling member 34 which engages the cup-shaped member 32. The coupling member 34 and the shaft 170 are rotated by apinion' 35 having an elongated hub 35 which is journaled in the reduced part 33 of the bearing member 33. The hub 35 is provided with projecting tongues 35 which engage the notches 3.4 formed in opposite sides of the coupling member 34, thereby formin a driving connection between the pinion and the coupling member. The pinion and the coupling member are held in assembled relation by means of a stud 36 which passes through the pinion and threadedly engages the bore of the coupling member. his arrangement permits the rotation of the shaft 170 and at the same time allows longitudinal movement of that shaft due to the sliding engagement of the cup-shaped member-32 w'iththe coupling member 34 and the earing member 33. The rotation of the shaft 170 is effected by a train of mechanism 'which rotates the pinion 35 to different angular positions corresponding to different column positions of the carriage, and the longitudinal movement of the shaft is effected by the manual depression of a withdra'w key by which the machine is converted from an adding machine to a subtracting machine.

The rotation of the hammer block cam shaft 17 O to different angular positions is effected by the tabulating movements ofthe paper carriage 0 upon which the platen 17 is mounted, the locations of the cam projections in the shaft 170 being such that a certain desired hammer block condition is obtained in each column position of the carriage. The train of mechanism by which the shaft 170 is rotated is illustrated particularly in Figs. 1. 5, 7 and 9. The paper caron the back panel of the machine casing as in the said Gascon patent. There is also a fixed rod 10 mounted in the carriage side pieces somewhat above and rearwardly of the parallel tabulator rod 9 and this rod 10.carries a plurality of adjustable collars 14 upon which are mounted the rotatable rollers 40, 41, 42 and 43 of varying diameters corresponding in function to the similarly located rollers in the said Gascon patent. In the embodiment illustrated, there are five stops 12 for locating the paper carriage in five separate column positions and in four of these positions one of the rollers 40, 41, 42 or 43 is adapted to ride upon the cam-shaped end of a lever 7 and thereby actuate a train of mechanism which rotates the shaft 170 to produce varying hammer block efi'ects depending upon the diameter of the particular :oller in engagement with the lever 7. In this way a, hammer block setting is determined for the column positions fixed by four of the stops 12, the printing requirements for the column position determined by the remaining stop 12 being such that no hammer-blocking is necessary in that position.

The lever, arm 7 is spaced from the back panel of the machine, to align with the travel of the rollers, and is formed as a side piece of a pivotally mounted yoke 7 running below a long supporting stud 3 secured to the panel lever 178 by means of a spring 180. The

upper end of the arm 181 is notched to embrace a stud-on the rear end of a slide bar 182 which carries on the upper edge of its forward portion a rack 182 meshing with the pinion 35 by which the shaft 170 is rotated. Through these connections the shaft 170 is rotated to a greater or less degree depending upon the extent of depression of the lever 7 by one of the rollers, the resilient connection between the parts 17 8 and 181 being provided merely as a safety feature in case of a lock-up to prevent injury to the machine.

The slide bar 182 is normally held in its forward position by a spring 191 and it is slotted to engage supporting and guiding roller studs 192 mounted on the frame. The bar 182 is further provided on its under side with four notches 182 adapted to be engaged by a locking detent 195 by which the bar 182 llll is held in adjusted position during an op' eration of the machine. The locking detent is in the form of a sliding plate mounted against one of the side frames 31 of the printing mechanism and provided with an inverted V-shaped upper extremity for engagement with the notches. The detent 195 is carried on the end of an arm 197 which has its rear extremity bifurcated to engage a supporting stud 197 mounted on the adjacent frame 31. mally to move the detent 195 upwardly into engagement with the notches, and it is guided in its movement by a bushing on one of the studs 197 engaging an elongated slot 195 in the detent, as shown in Fig. 9. When the parts of the machine are in normal positions, as shown in Figs. 1, 5 and 8, the detent 195 is restrained against the action of the spring 196 by the engagement of the nose 712, of a side frame of the restoring bail 712,engaging the ledge 195 formed at the lower end of the downwardly extending arm 195 formed on the detent. The restoring bail 712 for the hammers 715 is operated each time that the machine is operated through the link 8 02 connecting it with the plate 801 on the drive shaft 800, as heretofore explained, and during the tabulation of the carriage to a new column position, the restoring bail is in the retracted position so that the detent 195 is withdrawn to permit the movement'of the bar 182 in locating the shaft 17 0 in the required position for hammer blocking the printing mechanism..

The movement of the side plate of the restoring bail 712 is also utilized to vibrate the hammer block bail 160 which engages any catches depressed by the cam projections on the shaft 170. For this purpose, the side plates of the restoring bail have cam surfaces 712 engaging the rollers 160 mountedon arms 160 of the side plates 160* which carry the bail bar 160. The rollers 160" are maintained in engagement with the'cam surfaces 712 by a coil spring which is attached at its lower end to a stud on the arm 160 (Fig. 2) connected at its upper end to the stud 46 1n the frames 31. At the outset of the operation of the machine, the movement of the hammer block bail 712 operates through the cam surfaces -712" thereon to swing the hammer block bail 160-160 forwardly, thereby tripping any latches 717 whose catches have been depressed by the cam projections on the shaft 170 into the path of movement of the bail bar 160. The tripping of the latches 717 causes the related hammers to move slowly rearward without percussive action, thereby eliminating the printing by those sections of the printing mechanism whose catches have been depressed into the path of thebail 160.

The longitudinal movement of the shaft170 for producing more or different combinations A spring 196 tends norof the bail side plate and which is which is connected by a train of mechanism with the right-hand end of the shaft 17 0, as

viewed in Figs. 4, 5 and 6. This end of the shaft 17 0 is journaled in a sleeve 47 which is fixed in a hub 48 held stationary on the side frame 31 by screws 49 and, rotatably mounted on the pro ecting end of the sleeve 47 and on the reducedextremity of the shaft 17 0, is a complementary hub member 50 having V- shaped cam projections 50 on its inner end face normally engaging corresponding notches 48 in the end face of the stationary hub 48. A crank arm 51 is secured on the outer end of the hub 50 and the outer end of this hub engages a roller bearing 52 secured on the shaft by nuts 53. The sleeve 47 has an inturned shoulder 47 a at one end and a coil spring 54 surrounding the shaft extends between this shoulder and the shoulder 47 formed at the inner end of the reduced portion of the shaft, thereby tending normally to move the shaft 17 0 toward the left as viewed in Fig. 6, and maintaining the V- shaped cam projections 50 in engagement with the notches 48. It will,be apparent, however, that when the hub 50 is turned by angular movement of the crank 51, the projections 50 ride outwardly on the sides of the notches 48 and thus move the shaft 170 longitudinally. This longitudinal movement changes the positions of the cam projections 170 and 17 0 with respect to the catch 717 and also the positions of the cam projections 170 and 17 0 with respect to the catch 717 so that the subsequent rotation of the shaft 17 0 by the movement of the paper-carriage produces a different hammer block condition than would have been effected by the tabulation of the carriage to the same column position with the shaft 17 0 in the normal inner position in which the spring 54 tends to maintain it. The uses and advantages of this increased capacity of imprint elimination mechanism are set forth-more fully hereinafter.

The crank 51 carries a crank pin 51 which is engaged by the bifurcated lower extremity of an arm 55 made up of two pivoted parts 55 and 55 which are normally maintained in alignment by a spring 56 and its connecting pins, thus insuring against damage in case of a lock-up. The arm 55 is fixed on a shaft 57 which is journaled in the side frames of the machine and the angular movement of which serves to convert the machine from an adding to a subtracting machine as hereinafter explained. The shaft 57 has'a crank arm 58 fixed on the right-hand end thereof, as viewed in Fig. 5, and the outer bifurcated end of this crank is engaged by a pin fixed on an arm 59" of the withdraw key plate 59 upon the upper end of which is mounted the withdraw key 60. The lower end of the key plate 59 is a stud 65 fixed in the frame 64 and engaging machine as shown at 7 0 1 foot 70 an elongated slot 59' in the key plate. The key plate 59 is normally retained in its uppermost position by a coil spring 66 which connects the upper part of the plate with a fixed stud 67, but when the key i depressed the plate 59 is moved downward y against the tension of the spring, thereby'rotating the shaft 57 and causing a change in the hammer block setting as well as a change in the operating mechanism whereby subtraction is effected instead of addition.

The depression of the key 60 and its plate 59 can be effected only when the. paper carriage is in the proper column position for the entry of a withdraw item, i. e., an item to be subtracted. This is insured by a lever 70 which is pivoted on a stud 71 and which is provided at its up er and inner end with a transverse flange O adapted to engage a notch 59 in the key-plate 59, as shown, for example, in Fig. 5. The lower part of the lever 70 is bent outwardly from the adding and is provided with an inclined foot or cam plate 70 adapted to be'engaged by a lug 72 carried by the tabulation rod 9.. When the carriage is tabulated to the proper column position, the foot 70 engages the lug 72, thereby moving the flange 70 out of engagement with the notch 59 and permitting the withdraw key 60 to be depressed. The downward movement of the of the lever 70 is limited by the engagement of a lug 7O of the lever with a pin 73 projectingfrom the right side frame 31. A coil spring 74, connecting the pin 7 3 link 93 having connections like those described in the above mentioned Muller patent for effecting the reversal of the machine whereby it effects subtraction instead of addition. The link 93 is provided with a lateral arm carrying a pin ,93 which engages a slot 91 in a lever 91. The lever or link 91 is pivoted at its upper end on an arm 90 and it extends rearwardly therefrom to the vicinity of the familiar power shaft 800 having mounted thereon the cross arm 92 provided with upper and lower studs 92 and 92", respectively.v The rear end of the link 91 .is bifurcated for cooperation with the studs,

the upper portion being hook-shaped to coact with the stud 92 while the lower arm of the bifurcation is shouldered to cooperate with the stud 92*. When the link 93 is elevated. by the downward movement of the crank arm 75 on the shaft 57, the link 91 is moved by the engaging pin 93 so that the upper hookshaped portion of the bifurcated end of the link 91 is in line with the stud 92. With this arrangement of the parts, the operation of the machine and the resulting rotation of the power shaft 800 in a counterclockwise direction, as viewed in Fig. 10, results in forcing the link 91 rearwardly, thereby operating the arm 90 so that the register pinions 916 are disengaged from the racks 610 by the rocking of the cradle 910', and the pinions 916 are brought into engagement with the racks, thereby reversing the operation so that subtraction is effected by the operation of the machine. The conversion of the machine into a subtraction machine may also be effected directly and independently of the withdraw key by operating the lever 88 which is pivoted on the stationary stud 82 by which the lever 90 is with the upper partof the lever 70,serves\piyotally supported. The lever 88 has an normally to hold the flange 70 against the key-plate 59.

As heretofore indicated, the depression of the withdraw key 60 for changing the hammer block setting by the longitudinal movement of the cam shaft 170, operates also to change the machine'from an adding machine to a subtracting machine. This is accomplished through a train of mechanism actuated by a crank arm 75 mounted on the end of-the shaft 57 opposite the withdraw key 60. The end of the crank arm 75 overlies a pin 7 6" carried by a slidable plate 7 6 mounted for vertical movement in a slotted guide plate 77 carried by the side frame of the machine. Thelower part 'of the late 76 is provided with a limiting guide s 0t 7 6 engaged by a screw 76 mounted in the side frame, and the ofl'set lower extremity 7 6 of the plate 76 carries a pin 76 having engagement with the bifurcated extremity of a lever 79 pivoted at the point 80 on the side frame. The end of the lever 79 opposite the pin 76 underlies a pin 81 which projects from a depending 8.1IIT88'1 provided with a pin 88 which engages a slot i-n---the upper end of the link 93, so thatwhen the upperend of the lever 88 is rocked, the link 93 is elevateddn substantially the same way that it is elevatedlby the operation of the lever 79. When the linl? 93 is operated by the lever 79, the slot in the upper end of the link slides on the pin 88", thereby guiding the link in its vertical movement without affecting the lever' 88. The lower stud 92 operates in' the well-known manner to set the parts for addition.

In addition to its functions in providing a new setting of the hammer block mechanism and in converting the machine from an adding to a subtracting machine, the depression of the withdraw key 60 serves also to effect a. simultaneous depression of the usual motor touch bar 126, which is overlapped by the withdraw key as shown particularly in Fig.

3, whereby the parts are locked in their depressed positions in order to set parts of the adding machine for repeat operations. As explained in the prior Muller patent mentioned above, the motor touch bar 126 is mounted upon spring-connected levers 127 and 127, the former having a pin and slot connection with the familiar vertical bar 128 with which this lever is connected by a spring 129 as in the J. G. Vincent Patent No. 866,750. In the present instance, as in the said Muller patent, a latch 130 pivoted upon the lever 127 and connected to it by a spring 131, is adapted,-upon depression of the touch bar 126, to

engage with a stud 127 upon the lever 127.

and thus prevent restoration of the lever and touch bar to normal position. These parts are as shown and described in the aforesaid Muller patent but there is provided in addition' a lever of bell-crank form 95 which is pivoted on a stud 96 carried by the key plate 59, the upper arm of this bell-crank lever being. engaged by a stud 97 which projects outwardly from the face of the key-plate 59, so that when the key-plate is depressed, the lower arm 95 moves downwardly at one side of the block 95d mounted on the pin at the same time that the key 60 depresses the touch bar 126. However, when the touch bar is depressed independently of the key 60 during addition the engagement of the bifurcated extremity 95 of the bell crank lever with a stud 95 which projects from the end of the lever 127*, moves the arm 95 over the top face of the block 95 and thus prevents depression of the withdraw key during addition. As explained in the prior Muller patent, the roller stud 311 on the full stroke sector 311 operates to depress the bar 128 and open the clutch of the driving motor of the machine, but when the touch bar 126 is latched down, its spring 129 remains in tension and the bar 128 is therefore again elevated so that a second operation of the machine automatically ensues. A slide bar 140 arranged between the keyboard plates and drawn rearwardly by a spring (shown in Muller Patent 1,397,774) has a lateral lug 140 adapted to act upon the upstanding tail of the latch 130. The operation of this slide bar 140 upon the repeat mechanism is as explained in the prior Muller patent.

It will be understood that in the operation of this machine, it is commonly desirable to set up the date on the keyboard at the begin ning of the day, for example. and to allow this setting to remain throughout the day, wherefore it is desirable to block out the printing of the date in those columns of the printed sheets in which the date is not to appear. In connection with the form of adding machine herein illustrated. there may be used the form of date repeat mechanism disclosed in the patent to R. E. lVing, 1,351,082, dated August 31, 1920.

The operation of the machine herein described may perhaps be best understood by reference to Fig. 13 of the drawings which shows two examples of work which may be performed With a machine embodying the particular hammer block mechanism shown in the accompanying drawings. It will be understood that the arrangement of the stops 12 for determining the column positions and the arrangementof the cam projections on the shaft 170 are determined in advance to suit the particular requirements of the bank or other business institution in which a special form of ledger sheet may be used. Thus, for convenience of manufacture, the cam shafts 170 are commonly made up with a large number of cam projections extending from end to end and when the cam shaft is fitted in a certain adding machine intended for a particular use or kind of work, all of those cam projections are cut off except the particular ones which are required. The pinion 35 on the shaft 170 may be rotated to a number of different angular positions corresponding to the number of cam points provided on the circumference of the shaft. As illustrated in the drawings the shaft 170 is capable of being stopped in four different angular positions by the engagement of the detent 195 with any one of the four notches 182, this being the preferred arrangement. Four possible hammer block conditions or settings are thus produced by the location of the shaft 170 in different angular positions. In addition, other hammer block settings or combinations may be brought about by shifting the shaft 170 longitudinally, without providing additional angular settings for the cam shaft. The cam shaft might. be designed to permit the longitudinal shifting thereof in any one of its angular positions, but to suit the needs of the examples of work illustrated in Fig. 13, it is only necessary to effect the longitudinal shifting of the shaft 170 in one angular position thereof and, to permit this longitudinal shifting while maintaining a hammer block of the date printing mechanism, the cam projection 170" is provided with a broad face so that it may slide on the catch 717*. In Fig. 13 of the drawings, there are illustrated two examples of the use of the machine illustrated in the drawings, the first example being set forth on two sheets A and A, which are adapted to be placed in the carriage of the adding machine side by side. The sheet A may be intended for the permanent record of the bank, for example, and the sheet A, may be intended for delivery to the banks customers. The sheets A and A will show the use of the adding machine in recording an item which is added to the previous balance, while the sheets B and B, adapted to be placed in the adding machine together, show the condition of the record after the entry of an item which is subtracted from the previous balance. In each of the examples of work illustrated in Fig. 13. there are fire columns. It will be observed that these columns are closely related and that while at the same time shifting the hammer block cam shaft 170 longitudinally due to the angular movement of the hub 50 carrythe projections 50* This depression of the withdraw lrey 60 will be permitted by the unlatching of the key plate 59 from the flange on the lever 70, since the lever is then operated on by the stud 72 on the tabulation rod engaging the foot piece 70 at the lower end of the lever. lhisoccurs only in the column 2 position and prevents the depression of the hey 60 when the carriage is in any other col umn position. When in this column 2 position, the catch 717 is depressed by the broad tooth 170 on the cam shaft, as shown in Fig. 4, and the cam projection 1T0 is then located in the vertical plane of the catch 717, but the last mentioned catch is not depressed. T he printing mechanism of the folio section will have been restored after the printing of column 1 and since the date is hammer blocked in column 2, only the amount of the transaction is printed in column 2 of sheet B. The carriage is then tabulated to the column 3 position, in which the lever 7 is engaged by the roller 4.2 but, since the shaft 170 has been shifted longitudinally, the amount printing section is not hammer blocked as it was when printing column 3 of sheet A and the withdrawal. item of $350.00 is therefore printed in column 3 of sheet B, the date section of the printing mechanism being simultaneously hammer blocked and the folio number being not set up on the keyboard. When the carriage is then tabulated to the column ll position, determined by the stop 12", the'cam shaft 170 returns to its normal position, since the lever 7 is not then engaged by any roller, but during the rotation of the shaft 170 to its normal position the cam projection 1'70 engages the catch 717 and depresses it so that the amount printing section of the printing mechanism is hammer blocked in this position and (when the machine is operated, only the date is printed, there being no folio number set up on the keyboard. When the carriage is next tabulated to the column 5 position, the new balance of the customer is printed, the hammer block condition being then effected by the roller 43 as when printin the column 5 item of sheet A. From the oregoing it will be apparent that the longitudinal shifting of the shaft 17 0 when the carriage was in the column 2 position operated to determine automatically the proper hammer-block conditions which should be obtained in the positions of column 3 and column 4, whereby the withdraw item was printed in the column 3 position and the amount printing section hammer-blocked in the column 4 position. Thus, with the same rollers on the shaft 10 and the same carriage operated means for determining the hammer block settings of the shaft 170, new and different arrangerses merits provide in various column positions acco' to character the item to be ent o, This n :nbility in the adjustment of the ham mer block mechanism for producing ent hammer-block effects in the same coin positions without changing the inechani operated by the movement of the carriage, is preferably combined with the means for converting the machine from an adding machine to a subtraction machine through the manipulationof a single lrey, whereby the settin of the hammer block mechanism is predetermined for succeeding column posi tions the same time that the operator enters the item in the transaction column of the sheet l/Vhen the key 60 is depressed in the second column position during the printing of the sheet B, the overlapping of that key and the upper end of the touch bar 126 causes the touch bar to be pushed downwardly and it is held downwardly by the mechanism heretofore described so that the adding machine is set for a repeat operation. If the item to be entered in column 2 is not a withdraw item,

but a deposit item as indicated in column 2' of sheet A, the operator does not depress the withdraw key 60, but depresses the touch bar 126 instead.

in Figs. 14, 15, 16 and 17 of the drawings,

there is illustrated a modified form of mecha nism for effecting the longitudinal shifting of the cam shaft by which the hammer-blocking is effected. The other parts of the mechanism are as illustrated in connection with the embodiment of the invention first described. These parts have therefore been'identified by the same reference numerals. In the m0ditied form of construction, the cam shaft 270, corresponding to the cam shaft 170 previously described, is journaled in side frames 231 of the printing department of the adding machine, and is provided with cam projections 270, 270, 270, and 270, which are adapted to engage the catches 717" and 717 and die press these catches when the cam shaft is in the proper angular positions as determined by the shifting of the rack bar 282, actuated by the tabulation of the paper carriage, and provided with rack teeth 282 which mesh with a pinion 235 fixed on the end of the shaft 270. In this case, the pinion 235 is elongated, as shown particularly in Fig. 17, so that the shaft and pinion may be shifted longitudinally while retaining the rack teeth 282 in engagement with the pinion teeth. The rack bar 282 is provided with teeth 282 so that it may be secured in adjusted position by the action of the detent 195 as in the operation of the first form of the invention. A collar 250, having an annular groove 250, is secured on the outer end of the shaft 270 in fixed relation to the pinion 235 and the groove 250% is engaged by a pin 251 carried by a bell ill crank lever 252. This lever is pivoted on a stud 253 carried by a bracket 254 carried by the side frame 231 of the printing mechanism. The pin 251 is mounted on the short arm 252 of the lever and the outer end of this arm is connected by a coil spring 255 to the adjacent frame so that the spring tends normally to maintain the shaft 270 in its inner position. The upper arm 252 of the lever engages the bifurcated lower extremity of a lever 256 secured on a shaft 257, corresponding to the shaft 57 heretofore described. The shaft 257 is actuated by a crank arm 258 which is pivotally connected to a key plate 259 carrying at its upper end the withdraw key 260. This withdraw key overlaps the touch bar 126 and its mounting and operating connections are in all respects similar to those of the withdraw key 60 and its plate 59. IVhen the withdraw key 260 is depressed, the shaft 270 is shifted longitudinally to change the hammer block setting but in this instance the shaft moves toward the left instead of toward the ri ht as in the form of the invention first descri ed.

Although certain forms of the invention have been shown and described. by way of illustration, it will be understood that the invention may be constructed in various other embodiments within the scope of the appended claims.

I claim: v

1. In combination, in an accounting machine having a traveling paper carriage, a printing mechanism subdivided for multicolumn work,.adjustable means controlled by said carria e acting to automatically and selectively edect imprint elimination by preventing the printing operations of different subdivisions of said printing mechanism in different columnar positions of said carriage, and separate means independent of said carriage for changing the normal carriage-controlled, selective action of said carriage controlled means in effecting imprint elimination in certain of the columnar positions of the carriage.

2. In combination, in an accounting machine having a traveling paper carriage, a printing mechanism subdivided for multicolumn work, means actuated by said carriage to automatically and selectively effect imprint elimination by preventing the print ing operations of different subdivisions of said printing mechanism in different columnar positions of said carriage, and manipulative means independent of the carriage acting, when manipulated, to change the normal selective effect of said carriage actuated means when actuated by said carriage in effecting imprint elimination in given columnar positions of said carriage.

In combination, in an accounting machine having a traveling paper carriage, a printing mechanism subdivided for multicolumn work, means controlled by said carriage acting to automatically and selectively effect imprint elimination by preventing the printing operations of different subdivisions of said printing mechanism in different 00- lumnar positions of said carriage, and separate means operable independently of said carriage in one columnar position of the latter for changing the normal selective control of imprint elimination by said carriage in other columnar positions thereof.

4. In combination, in an accounting machine having a traveling paper carriage, a printing mechanism. subdivided for multicolumn work, means controlled by said paper carriage acting to automatically and selectively effect imprint elimination by preventing the printing operations of different subdivisions of said printing mechanism in different columnar positions of said carriage, manually operable means independent of said carriage for varying the selectivity of the control of said carriage controlled means by said carriage in certain columnar positions of the latter, and means pre venting manipulation of said manually operable means except in a predetermined columnar position of the carriage.

5. In combination, in an accounting machine having a traveling paper carriage, a printing mechanism subdivided for multicolumn work, means controlled by said carriage acting to selectively effect imprint elimination by preventing printing operations of different subdivisions of said printing mechanism in different columnar positions ofsaid carriage, said means including a cam shaft rotated by said carriage todetermine the extent of imprint elimination in different columnar positions of said carriage, and means for shifting said cam shaft longitudinally to change the normal selective control of imprint elimination by said carriage incertain columnar positions of said carriage to another selective control.

-6. In combination, in an accounting machine having a traveling paper carriage, a printing mechanism subdivided for multicolumn work, means for preventing printing operations in different subdivisions of said printing mechanism including catches adapted to be depressed into the path of a rceiproeating member, a cam shaft having projections acting, upon rotation of said shaft, to different angular positions to depress certain of said catches into the path of said reciprocating member, connections actuated by said carriage to rotate said cam shaft to predetermined angular positions in different columnar positions of said carriage, and means for shifting said cam shaft longitudinally to vary the operative effect on said catches of the rotation of said shaft by said carriage.

7. In combination, in an accounting machine having a traveling paper carriage, a

printing mechanism subdivided] for multicolumn work, means for preventing printing operations in different subdivisions of said printing mechanism, catches for operating said last-named means, a reciprocating member adapted to engage said catches, a cam shaft having rojectlons acting, upon rotation of said sha to depress said catches into the path of said reciprocatin member to thereby effect the operation 0 said imprint elimination means, means actuated b' said carriage in different columnar pos tions thereof to rotate said cam shaft to predetermined angular positions whereby different catches are depressed in different columnar ositions of'said carriage, and means forshi ting said cam shaft longitudinally to vary the operative effect of said campro jections on said catches in said columnar positions, said cam shaft having a broad faced cam projection adapted to permit the longitudinal shifting of said shaft while maintaining one of said catches depressed into the path of movement of said reciprocating member.

8'. In combination, in an accounting machine having a traveling aper carriage and means for conditioning t e machine to perform different functions, a printing mechanism subdivided for multl-column work, means controlled by said carriage to selectively and automatically effect imprint elimination b preventin the printing operations of ifierent SlllXfiVlSiOIlS of said printing mechanism in different columnar posi-, tions of said carriage, a manually operable member for operating said conditioning means, and connections controlled by said manually operable member for changin the normal selectivity of the control of sai imprint eliminating means by said carriage in certain of said columnar positions.

9. In combination, in an accounting machine having a traveling paper carriage, a 45 printing mechanism subdivided for multicolumn work, means actuated by said aper carriage to selectively'and automatical y determine the subdivision of said printing mechanism, conditioning means-for condio tioning said machine to perform differentfunctions, and mechanism controlled by said conditioning means to vary the normal selective effect of the actuation of said subdivision determining means by said carriage.

10. In combination, in an accounting machine having a traveling pa r carriage, a printing mechanism subdivi ed for multicolumn work, means controlled by said paper carriage acting to selectively and auto- 00 matically determine the subdivision of said printing mechanism, said means including a cam shaft rockable to diflerent angular positions by said paper carriage in the different columnar positions of the latter, conditionfll ing means for conditioning the machine to perform different functions, and mechanism controlled by said conditioning means for shifting said cam shaft longitudinally to change the normal selective effect of the carriage control of the subdivision of said printing mechanism to another selective control.

11. In combination, in an accounting machine having a traveling pa r carriage, a printing mechanism subdivi ed for multicolunm work, adjustable means controlled by said carria e actingto selectively and automatically e ect imprint elimination by preventing the printin operations of different subdivisions of sai printing mechanism in different columnar ositions of said carriage, a0 a withdraw key an connections acting, when said key is depressed, to condition the machine for subtraction, and means actuated by said withdraw key, upon depression of said key in one columnar position of said carria to vary the normal selective action of sai carriage controlled means in other columnar positions of said carriage.

12. In combination, in an accounting machine having a traveling paper carriage, a printing mechanism subdlvided for multicolumn work, means controlled by said carriage acting to selectively andautomaticully efiect imprint elimination by preventing the printing operations of different subdivisions of said printing mechanism in different columnar positions of said carriage, said means including a cam shaft rockable by said carriage to different angular positions, a withdraw key and connections for conditioning said machine for subtraction, and means operated by said withdraw key when it is deressed to shift said cam shaft longitudinaly to change the normal selective action of said carriage controlled shaft.

In testimony whereof, I have subscribed my name.

ROBERT L. MULLER. 

